Washington Post columnist Jennifer Rubin on Thursday ripped President Trump in an editorial for what she called possibly his “stupidest tweet ever.”

“President Trump has issued shameful tweets, offensive tweets and self-serving tweets,” the “Right Turn” columnist wrote in her latest column. “Rarely, however, has he sent out a tweet that better conveys his abject ignorance about the country and economics than the tweet he posted Wednesday.”

The conservative columnist was referring to a tweet Trump sent out Wednesday morning in which he stated the United States was “built on tariffs.”